1998 Ford Taurus Lights Dim at High RPM

1998 FORD TAURUS
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TROUT
  • MEMBER
  • 2 POSTS
When the PRM's get between 4k to 5k the lights dim. Headlights, dash lights, radio and the battery light come on but as soon as the trans shifts everything is fine. I don't know it it is related but about 2 months ago the clock never had the right time. Everytime I got in the car I had to set the clock for about a week. Since then the clock is fine. Thanks in advance.
Jan 27, 2006 at 5:12 AM
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GODBEAR839
  • ✓Experienced Mechanic
  • 77 POSTS
My f-150 did that when I bought it replaced the alternator and everything was fine after that.Have the charging system checked out and make sure it's not the battery and they should be able to let you know what is going on.Most battery places will do the test eitehr free or cheap.
Jan 27, 2006 at 7:35 AM
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Suggested Repair

Have the charging system tested, including the alternator and battery. A similar high-RPM dimming issue was resolved by replacing the alternator; many battery shops can perform the test free or inexpensively.

Conversation Summary

The owner of a 1998 Ford Taurus reports that headlights, dash lights, and the radio dim and the battery light comes on between about 4,000 and 5,000 RPM, then return to normal after the transmission shifts. A brief clock-reset issue from about two months earlier has since resolved. The expert says the same symptom on an F-150 was fixed by replacing the alternator and recommends having the charging system checked and confirming the battery is not the cause.

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